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Catalysts 2015, 5(3), 1498-1506; doi:10.3390/catal5031498

TiO2-Impregnated Porous Silica Tube and Its Application for Compact Air- and Water-Purification Units

1
Kanagawa Academy of Science and Technology, KSP building East 407, 3-2-1 Sakado, Takatsu-ku, Kawasaki, Kanagawa 213-0012, Japan
2
Photocatalysis International Research Center, Tokyo University of Science, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
3
Optical Communications R&D Laboratories, Sumitomo Electric Industries, Ltd., 1 Taya-cho, Sakae-ku, Yokohama 244-8588, Japan
4
General Planning Division, Sumitomo Electric Industries, Ltd., 1-1-3, Shimaya, Konohana-ku, Osaka 554-0024, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 24 June 2015 / Revised: 31 July 2015 / Accepted: 19 August 2015 / Published: 2 September 2015
(This article belongs to the Special Issue Catalytic Removal of Volatile Organic Compounds)
View Full-Text   |   Download PDF [618 KB, uploaded 2 September 2015]   |  

Abstract

A simple, convenient, reusable, and inexpensive air- and water-purification unit including a one-end sealed porous amorphous-silica (a-silica) tube coated with TiO2 photocatalyst layers has been developed. The porous a-silica layers were formed through outside vapor deposition (OVD). TiO2 photocatalyst layers were formed through impregnation and calcination onto a-silica layers. The resulting porous TiO2-impregnated a-silica tubes were evaluated for air-purification capacity using an acetaldehyde gas decomposition test. The tube (8.5 mm e.d. × 150 mm) demonstrated a 93% removal rate for high concentrations (ca. 300 ppm) of acetaldehyde gas at a single-pass condition with a 250 mL/min flow rate under UV irradiation. The tube also demonstrated a water purification capacity at a rate 2.0 times higher than a-silica tube without TiO2 impregnation. Therefore, the tubes have a great potential for developing compact and in-line VOC removal and water-purification units. View Full-Text
Keywords: photocatalysis; outside vapor deposition; porous amorphous-silica; acetaldehyde removal; air purification; water purification photocatalysis; outside vapor deposition; porous amorphous-silica; acetaldehyde removal; air purification; water purification
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Ochiai, T.; Tago, S.; Hayashi, M.; Tawarayama, H.; Hosoya, T.; Fujishima, A. TiO2-Impregnated Porous Silica Tube and Its Application for Compact Air- and Water-Purification Units. Catalysts 2015, 5, 1498-1506.

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